Rock-drill.



No. 68W". Patented Aug. 20, I90I. 0. G. WUHSLEY.

R0 C K D R L L.

'cation filed Feb. 23

(NMI oooo 1 citizen of the United States, and a resident of UNITEDISTATES ATENT union.

OTTO G. VVORSLEY,F NEWARK, ILLINOIS.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent N o. 681,011, dated August20, 1901.

Application led February 23, 1901. Serial No. 48,600. (No model.)

To all whom it may concern:

Be it known that I, O'rro G. WORSLEY, a

Newark, county of Kendall, and State of Illinois, have invented certainnew and useful Im-` provements in Rock-Drills, of which the following isa specification and which are illustrated in the accompanyingr drawings,forming a part thereof.

This invention relates to percussion-drills of the class adapted moreparticularly for sinking well-shafts and in which there is provided alaterallyexpansible cutting-blade adapted to be automatically thrown outafter the drill is passed through and below the wellcasing.

of the ,drill and a detail of the well-casing,A

showing the cutter in different positions. Fig.

3 is a detailelevation of the drill, partly in section, from a point ot'view ninety degrees removed from that of Figs. 1 and 2; and Fig. 4 is adetail section on the line 4 4 of Fig. 1.

The lower end of the well-casing is shown at 10 and the shoe appliedthereto at 11. The stock 12 of the drill is tubular and is adapted to besecured, as shown, by means of screwthreads to a drill-rod. (Not shown.)An end cutter 13 is attached, as shown., by screwthreads to the lowerend of the drill-stock. The stock is longitudinally apertured along oneside, as shown at 14, and a side cutter or reamer 15, secured within thechamber of the stock, projects laterally through this aperture.

` The side cutter is provided with laterally-projecting stems 16 and 17,the former extending upwardly and the latter downwardly within thechamber of the stock. The stem 16 is provided at its outer end with ahook 18 for to slidingly engage the correspondingly-beveled lower end ofan inwardly-projecting boss 30, formed upon or secured to the wall ofthe stock 12 opposite the aperture 14.

The tension of the spring 21 is sufficient to draw up the cutter againstthe friction of the contacting faces of the bosses 29 and 30, and thecutter is thereby thrown outwardly by a cam action and is drawn forciblyagainst the shoulder 28, the boss 29 being seated upon the boss 30 andthe downwardly-projecting stem 17 lying against the opposite wall of thestock below the aperture 14. When the cutter is retracted, the boss 29seats itself under the boss 30, the lower end of the latter forming abeveled abutment which is engaged by the upper beveled edge of the boss29.

In use the cutter is introduced into the chamber of the stock by beinginserted downwardly through the aperture 14 and its hook 18 engaged withthe link 19. The link and the spring 2l and the cross-head 23, carriedthereby, are then pushed up into position, and the pin, which serves asa guide for and limits the downward movement of the link, is driven inplace, the legs 24 and 25 of the cross-head resting thereon. The cutteris held in its retracted position as the drill is inserted into theupper end of the casing 10 and is prevented, of course, from beingthrown out or expanded so long as the cutter is within this casing. Whenthe drill-stock has passed so far beyond the bottom of the casing 10that the side cutter is relieved from contact therewith, it is thrownout by the action of the spring 2l.

The end cutter 13 drills a hole of a diameter equal to its width, andthe side cutter reams out the hole to a sufficient diameter to receivethe casing 10.

The construction is such that the force of the blows struck by thecutter 15 is well distributed. As the cutter projects laterally,

IOO

the blow ot' course tends to tilt it, throwing itsupper end back and'itslower end outward, the tendency being to rock the cutter upon the bosses29 30. The major part of the blow is resisted by the shoulder 2S; but aconsiderable part of it is transmitted to the boss 30 and through thelower stem 17 to the opposite wall of the stock. This distribution ofthe force of the blows materially increases the durability of the parts.i

When it is desired to withdraw the drill, it

is simply necessary to apply a lifting strain 1o its stem, and when theupper end of the projecting portion of the cutter 15 comes into contactwith the shoe 11 of the well-casing the cutter is held and the spring 21compressed until the boss 30 has passed above the boss l29, when thelatter falls into the position shown in Fig. 2, and this action isfacilitated by the inclined form of the outer upper cor-` ner of `thecutter 15, as shown at 32. The cutter being in its retracted positionwhen the stock is lowered to the bottom of the wellcasing, alpassage isformed between the lower edge of the cutter 15 and the upper wall of theaperture 14, and unless some means were provided to close this passagemud or'dirt adhering to the inner wall of the casing might loe-scrapedinto the chamber of the stock and accumulating there clog the cutter andpossibly prevent it from expanding.

the .recess 34 on the stock, is provided for closing the passage whenthe cutter is retracted. Such slide is slotted and held by a pin 35,which passes through the slot in the` slide-and Yguides the same infrictional en- In order to avoid this diculty, a slide 33, located ingagement with the bottom of` the recess, so that lthe slide may bemaintained in .the desiredY position without other holding means.

When it is desired to remove the cutter from the stock, the slide ismoved away from across the bottom of the aperture 14..

I claim as my invention- 1. In a rock-drill, in combination, a chamberedstock having a lateral aperture, a cutter housed within the chamber andprojecting through the aperture, and having a bearing against the topWall of the aperture,

3. In a rock-drill, in combination, a chan1 4bered stock having alateral aperture, a cutter housed within the `chamber and projectingthrough the aperture, and a slide for closing the passage between thelower wall ofthe aperture and the lower edge of the cutter when thecutter is in its .retracted position.

oTTo e. woRsLnY.

Witnesses:

IvER JOHNSON, H. NUTSEN.

